Question
330Â Â Â 240Â Â Â 160Â Â Â 90Â Â Â 30Â Â
 ? What will come in place of the question mark (?) in the following series?Solution
330 – 90 = 240 240 – 80 = 160 160 – 70 = 90 90 – 60 = 30 30 – 50 = - 20
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5, 9, 17, 33, ?, 129
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